Both Xlpeptides and Ascendpeptidesuk publish their own verifiable Janoshik certificate of analysis, so both clear The Peptide Watch's bar; ranked by most recent certificate, Xlpeptides (Mar 2026) is currently more recent than Ascendpeptidesuk (Mar 2026). Both are among the only 28 of 318 UK sellers that pass. The Peptide Watch takes no vendor money.
| Checkable fact | Xlpeptides | Ascendpeptidesuk |
|---|---|---|
| Own-name Janoshik COA | Yes | Yes |
| Latest certificate date | Mar 2026 | Mar 2026 |
| Verified rank | #17 | #18 |
Full audits: Xlpeptides · Ascendpeptidesuk. Both appear on the independently-tested list.